Table 1.

Summary of incidence of positive heartworm antigen test results and the relative change in incidence 2013 to 2016

State/Region	2013			2016			Relative change in incidence 2016 vs 2013 (%)
	No. of tests conducted	No. of positive results	Incidence (%)	No. of tests conducted	No. of positive results	Incidence (%)
United States	6,980,504	77,557	1.11	9,266,427	118,689	1.28	15.28
Alabama	84,958	2481	2.92	114,531	4428	3.87	32.39
Arkansas	36,283	1259	3.47	55,482	2405	4.33	24.92
Florida	594,004	7979	1.34	712,653	9048	1.27	-5.48
Georgia	241,678	5348	2.21	317,229	7842	2.47	11.71
Louisiana	61,321	3782	6.17	103,667	7242	6.99	13.27
Mississippi	16,017	1340	8.37	38,579	2905	7.53	-9.99
Missouri	145,571	1437	0.99	168,206	2549	1.52	53.51
North Carolina	324,493	6555	2.02	441,015	9386	2.13	5.36
Oklahoma	44,351	831	1.87	60,327	1363	2.26	20.58
South Carolina	136,549	3099	2.27	176,438	4550	2.58	13.63
Tennessee	140,553	3423	2.44	173,571	5326	3.07	26.00
Texas	525,667	14,322	2.72	735,395	23,489	3.19	17.23
Southeastern USA	2,351,445	51,856	2.21	3,097,093	80,533	2.60	17.91
Rest of USA	4,629,059	25,701	0.56	6,169,334	38,156	0.62	11.40